/*
 * MIT License
 *
 * Copyright (c) 2019 Mr.css
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

package cn.seaboot.commons.thread;

import org.jetbrains.annotations.NotNull;

import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 代码与{{@link Executors#defaultThreadFactory()}}完全一致
 * <p>
 * 只是更加强调 name 在 Thread 中的作用，
 * 强制程序员在使用线程池的时候，增加 prefix 字段，方便进行代码维护。
 *
 * @author Mr.css
 * @version 2019/12/6
 * @see Executors
 */
public class CustomThreadFactory implements ThreadFactory {
    private final String prefix;
    private final ThreadGroup group;
    private final AtomicInteger threadNumber = new AtomicInteger(1);

    /**
     * -
     *
     * @param prefix 名称前缀
     */
    public CustomThreadFactory(@NotNull String prefix) {
        SecurityManager s = System.getSecurityManager();
        group = (s != null) ? s.getThreadGroup() :
                Thread.currentThread().getThreadGroup();
        this.prefix = "pool-" + prefix + "-thread-";
    }

    /**
     * 创建一个线程
     *
     * @param runnable -
     * @return -
     */
    @Override
    public Thread newThread(@NotNull Runnable runnable) {
        Thread t = new Thread(group, runnable, prefix + threadNumber.getAndIncrement(), 0);
        if (t.isDaemon()) {
            t.setDaemon(false);
        }
        if (t.getPriority() != Thread.NORM_PRIORITY) {
            t.setPriority(Thread.NORM_PRIORITY);
        }
        return t;
    }
}